sys.identity_columns

This is the third(see edit below) catalog view that I will cover, I have already covered sys.dm_exec_sessions and sys.dm_db_index_usage_stats For a list of all the catalog views click here

EDIT: Obviously I need to get more sleep because sys.identity_columns is not one of the Dynamic Management Views

Today we will talk about the sys.identity_columns Object Catalog View
The view sys.identity_columns contains a row for each column that is an identity column
If you look at this view in Books On Line you will notice that there are only 4 columns described
seed_value
increment_value
last_value
is_not_for_replication

However when you run SELECT * FROM sys.identity_columns you get back 26 columns. My first impression was that the documentation was incomplete, however when you look closer you will see that the first thing mentioned is
[columns inherited from sys.columns] For a list of columns that this view inherits, see sys.columns (Transact-SQL).
So this view return 4 columns in addition to what the sys.columns view returns

Make sure that you are using SQL Server 2005 and are in the AdventureWorks database
Okay so let's start, the way I write about these views is that I don't want to just copy what is in BOL. I try to have a couple of queries that will show you how to accomplish some things by using these views

Let's select all columns that have the identity property set by using the sys.columns view

SELECT *
FROM sys.columns
WHERE is_identity =1

Now run the following query

SELECT *
FROM sys.identity_columns

As you can see you get back the same number of rows only you get 4 additional columns back which have some information that only deal with identity columns


EDIT: Someone left me a comment (thank you) and I decided to update the post, the following query

SELECT * FROM sys.columns
WHERE is_identity =1

will return a column names is_computed, but the following query below will not

SELECT *
FROM sys.identity_columns

Which makes sense since an identity column can not be computed
END EDIT

Let's try some other things, let's select only the columns that have a tinyint as an identity column, this is easy to do we just join with the sys.types view


SELECT i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE t.name ='tinyint'

Or let's see how many different integer data types have the identity property set

SELECT t.name,COUNT(*) as GroupedCount
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
GROUP BY t.name

And the results are below

name GroupedCount
----------------------
bigint 3
int 43
smallint 3
tinyint 2

So that is all fine but how do we know what table this column belongs to? That's pretty easy to do we can just use the OBJECT_NAME function
--tinyint only
SELECT OBJECT_NAME(object_id) AS TableName,t.name,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE t.name ='tinyint'


--smallint only
SELECT OBJECT_NAME(object_id) AS TableName,t.name,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE t.name ='smallint'




There is a small problem with using OBJECT_NAME(object_id) to get the table name
We should be using this instead

SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) as FullTableName

Why am I doing this? This is because SQL server 2005 introduced schemas
so basically if we do this

SELECT * FROM HumanResources.Department

we have no problem, but if we run the following query

SELECT * FROM Department

we get this friendly message

Server: Msg 208, Level 16, State 1, Line 1
Invalid object name 'Department'.

Now let's create a Department table

CREATE TABLE Department (ID INT IDENTITY NOT NULL)

When we run this query

SELECT SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,
CASE t.name WHEN 'tinyint' THEN 255 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'smallint' THEN 32767 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'int' THEN 2147483647 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'bigint' THEN 9223372036854775807 -COALESCE(CONVERT(INT,last_value),0)
END AS ValuesLeft ,
OBJECT_NAME(object_id) as TableName,t.name,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE seed_Value > 0
AND OBJECT_NAME(object_id) like 'DE%'
ORDER BY TableName

We will see two rows

dbo.Department 2147483647 Department int
HumanResources.Department 32751 Department smallint

One table is dbo.Department and the other table is HumanResources.Department

Now when we run the same queries again there is no problem
SELECT * FROM Department


SELECT * FROM HumanResources.Department

You can read up more on schemas in BOL, let's get back to sys.identity_columns


let's do something interesting now, let's find out how many more identity values we have left until we run out

SELECT SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,
CASE t.name WHEN 'tinyint' THEN 255 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'smallint' THEN 32767 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'int' THEN 2147483647 -COALESCE(CONVERT(INT,last_value),0)
WHEN 'bigint' THEN 9223372036854775807 -COALESCE(CONVERT(INT,last_value),0) END AS ValuesLeft ,
OBJECT_NAME(object_id) as TableName,t.name,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE seed_Value > 0
ORDER BY FullTableName


You can also calculate the percentage used

SELECT SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,
CASE t.name WHEN 'tinyint' THEN 100 -(255 -COALESCE(CONVERT(INT,last_value),0)) /255.0 * 100
WHEN 'smallint' THEN 100 -( 32767 -COALESCE(CONVERT(INT,last_value),0)) /32767.0 * 100
WHEN 'int' THEN 100 -(2147483647 -COALESCE(CONVERT(INT,last_value),0)) /2147483647.0 * 100
WHEN 'bigint' THEN 100 -(9223372036854775807 -COALESCE(CONVERT(INT,last_value),0)) /9223372036854775807.0 * 100
END AS PercentageUsed ,
OBJECT_NAME(object_id) as TableName,t.name,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE seed_Value > 0
ORDER BY PercentageUsed DESC


Now let's find all the columns where the seed value is not 1
SELECT seed_value,SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE seed_value > 1
ORDER BY FullTableName


Now let's find all the columns where the increment value is not 1
SELECT increment_value,SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE increment_value <> 1
ORDER BY FullTableName

No rows are returned, now let's put that to the test by creating a table and have the value increment by 5

CREATE TABLE dbo.Department2 (ID INT IDENTITY (1,5) NOT NULL)

Now run the query again

SELECT increment_value,SCHEMA_NAME(CAST(OBJECTPROPERTYEX(OBJECT_ID, 'SchemaId') AS INT))
+ '.' + OBJECT_NAME(OBJECT_ID) AS FullTableName,i.*
FROM sys.identity_columns i JOIN sys.types t ON i.user_type_id = t.user_type_id
WHERE increment_value <> 1
ORDER BY FullTableName

And that covers some uses of the sys.identity_columns view, the only thing left is the description of the view itself


Column name
Data type Description

object_id
int ID of the object to which this column belongs.

name
sysname Name of the column. Is unique within the object.

column_id
int ID of the column. Is unique within the object.
Column IDs might not be sequential.

system_type_id
tinyint ID of the system type of the column.

user_type_id
int ID of the type of the column as defined by the user.
To return the name of the type, join to the sys.types catalog view on this column.

max_length
smallint Maximum length (in bytes) of the column.
-1 = Column data type is varchar(max), nvarchar(max), varbinary(max), or xml.
For text columns, the max_length value will be 16 or the value set by sp_tableoption 'text in row'.

precision
tinyint Precision of the column if numeric-based; otherwise, 0.

scale
tinyint Scale of column if numeric-based; otherwise, 0.

collation_name
sysname Name of the collation of the column if character-based; otherwise, NULL.

is_nullable
bit 1 = Column is nullable.

is_ansi_padded
bit 1 = Column uses ANSI_PADDING ON behavior if character, binary, or variant.
0 = Column is not character, binary, or variant.

is_rowguidcol
bit 1 = Column is a declared ROWGUIDCOL.

is_identity
bit 1 = Column has identity values

is_filestream
bit Reserved for future use.

is_replicated
bit 1 = Column is replicated.

is_non_sql_subscribed
bit 1 = Column has a non-SQL Server subscriber.

is_merge_published
bit 1 = Column is merge-published.

is_dts_replicated
bit 1 = Column is replicated by using SQL Server 2005 Integration Services (SSIS).

is_xml_document
bit 1 = Content is a complete XML document.
0 = Content is a document fragment or the column data type is not xml.

xml_collection_id
int Nonzero if the data type of the column is xml and the XML is typed. The value will be the ID of the collection containing the validating XML schema namespace of the column.
0 = No XML schema collection.

default_object_id
int ID of the default object, regardless of whether it is a stand-alone object sys.sp_bindefault, or an inline, column-level DEFAULT constraint. The parent_object_id column of an inline column-level default object is a reference back to the table itself.
0 = No default.

rule_object_id
int ID of the stand-alone rule bound to the column by using sys.sp_bindrule.
0 = No stand-alone rule. For column-level CHECK constraints, see sys.check_constraints (Transact-SQL).


seed_value
sql_variant Seed value for this identity column. The data type of the seed value is the same as the data type of the column itself.

increment_value
sql_variant Increment value for this identity column. The data type of the seed value is the same as the data type of the column itself.

last_value
sql_variant Last value generated for this identity column. The data type of the seed value is the same as the data type of the column itself.

is_not_for_replication
bit Identity column is declared NOT FOR REPLICATION.

Non Technical: What Sleepless Nights?

My wife took this picture and I just had to share it. I try to keep the non technical stuff for the weekends only but this was just too cute. When you look at a picture like this as a father you forget immediately that you have missed any sleep or that you son who is 2 and a half started his terrible two’s the moment he laid eyes on his brother and sister. However I will tell you that I have something very exiting related to SQL Server coming up this week so stay tuned……

SQL Server Utility SQLIOSim Is Available For Download

There are many components involved with reading and writing data to files. Starting from an application (SQL Server or SQLIOSim) the IO request is handed over to the Operating system via an API call. Once in the hands of the OS the request will travel through levels of filter drivers installed by things like antivirus software, backup utilities and finally find its way to a driver that will hand the actual data over to a disk controller, and eventually find its way to a disk or array of disks. There may be caching on the disks, and in the case of high end arrays there may also be logic to determine whether or not to service the request immediately or defer. If even one of these pieces get it wrong the results for your data would be disastrous.

Wouldn’t you rather know there is a problem before you entrust your data to such a complex process?

SQLIOSim is designed to generate exactly the same type and patterns of IO requests at a disk subsystem as SQL Server would, and verify the written data exactly as SQL Server would.

More details and download links are available here

Yahoo Launches .NET Developer Center, Windows Vista RC2 Available For Download

Yahoo Launches .NET Developer Center
Yahoo! Developer Network has launched .NET Developer Center.This site is your source for information about using the .NET Framework with Yahoo! Web Services and APIs. Here you'll find:

HOWTO Articles to help you understand our technologies and how you can use them better with .NET.
Download the sample browser, utility libraries and source code.
Other Resources on the web where you can find source code and helpful tools.
Community Resources where you can join our mailing list and discuss the Yahoo! APIs with us and with other .NET developers.


Windows Vista RC2 Available For Download
From the site: "Today, Microsoft is excited to announce the availability of Windows Vista RC2 to Technical Beta Testers, TAP Testers, and MSDN/TechNet subscribers. This new build of Windows Vista offers users a higher level of performance and stability – improving what was established in Windows Vista RC1. We were able to also fix many of your bugs reported from RC1 and implement them for RC2. Thank you to our beta testers for the bugs and feedback you submitted for RC1. The improvement shows as we raised our quality bar even higher!
"

Download it here

SQL Server Blog Of The Week: Snaps & Snippets By Mi Lambda (Matija Lah)

So here we are it's Friday and you know what that means; it's time for our blog of the week. The blog of the week is snaps & snippets by Mi Lambda (Matija Lah). Matija Lah lives in Slovenia, I have visited Slovenia many times; I have been to Ljubljana, Maribor, Koper and Bled. The first I heard about this blog was in the microsoft public sql server programming forum, if you visit the forum look out for the author ML



What do I like about this blog
There are some cool tricks and tips in this blog and the posting go into a lot of detail. it's like reading a book

What are some at the posts I like the most
Column Dependencies and Consequences
Unidirectional synchronisation
Full synchronisation
Date[Time] constructor SQL-style

Where can I see/read/hear more about the author?
check the microsoft.public.sqlserver.programming forum

So there you have it; the SQL Server blog of the week

SQL Challenge: Random Grouping Of Data

After Omnibuzz's challenge this morning I decided to come up with a challenge of my own

Let's say you have a table with data (what else would be in the table bananas? )The data looks like this
sony 4
sony 6
toshiba 1
toshiba 3
mitsubishi 2
mitsubishi 5

You want to return the results grouped together by company name but in random order
So for example the first resultset is

sony 4
sony 6
toshiba 1
toshiba 3
mitsubishi 2
mitsubishi 5

you highlight the query hit F5 and the next result is

toshiba 1
toshiba 3
sony 4
sony 6
mitsubishi 2
mitsubishi 5

See where I am going? The resultset is random but the company names are grouped together

Here is the deal no CTE or windowing functions (RANK, DENSE_RANK, ROWNUMBER or NTILE) you know what forget about SQL Server 2005, this has to be able to run on SQL Server 2000
Also no temp tables or table variables (added after first response ;-) )

I have 2 solutions to this, I will post the solutions some time tomorrow
Below is DDL + Insert script

Enjoy

CREATE TABLE #Testcompanies (
Name VARCHAR(50),
ID INT)


INSERT INTO #Testcompanies
SELECT 'toshiba' ,1
UNION ALL
SELECT 'mitsubishi', 2
UNION ALL
SELECT 'toshiba', 3
UNION ALL
SELECT 'sony', 4
UNION ALL
SELECT 'mitsubishi', 5
UNION ALL
SELECT 'sony', 6


Here are the 2 solutions I had in mind

--Query using a sub query and NEWID()
SELECT T.*
FROM #Testcompanies T
JOIN (SELECT DISTINCT TOP 100 PERCENT Name,
NEWID() AS GroupedOrder
FROM #Testcompanies
GROUP BY Name
ORDER BY NEWID()) Z
ON T.Name = Z.Name
ORDER BY Z.GroupedOrder


--Query using RAND()
DECLARE @R FLOAT
SET @R = RAND()

SELECT TOP 100 PERCENT *
FROM #TESTCOMPANIES
ORDER BY RAND(@R * CHECKSUM(NAME))


Does anyone else have a different solution than these two or the two in the comments?

Answer To A SQL Challenge By Omnibuzz (SQL Garbage Collector)

Omnibuzz has posted the following challenge: A scenario to ponder #1
This challenge is about returning a random number of customers and returnig them in random order, here is what he said:

Say you have a table:

Customers (CustomerID int primary key, CustomerName varchar(50))

A pretty simple table structure. And it has 1000 rows.
Now, I am conducting a contest for the customers where I will randomly pick up 5 to 20 customers every week and give away prizes.

How will I go about doing it?

I need to create a stored procedure/query/function that will accept no parameters but will return random list of customers and random number of customers (between 5 and 20)

And here is my solution

CREATE PROCEDURE ReturnRandomCustomers
AS
SET NOCOUNT ON
DECLARE @value INT

SELECT @value = CAST(5 + (RAND() * (20 - 5 + 1)) AS INT)


SELECT TOP @value *
FROM Customers
ORDER BY NEWID()
SET NOCOUNT OFF
GO

Since we are using SQL Server 2005 we can use TOP with a variable, and to set that variable we us the RAND function

The SQL Server 2000 version would look like this

CREATE PROCEDURE ReturnRandomCustomers
AS
SET NOCOUNT ON
DECLARE @value INT

SELECT @value = CAST(5 + (RAND() * (20 - 5 + 1)) AS INT)

SET ROWCOUNT @value
SELECT *
FROM Customers
ORDER BY NEWID()

SET ROWCOUNT 0
SET NOCOUNT OFF
GO

Red Gate's SQL Refactor Public CTP Released

That great company Red Gate has released a public CTP of their latest tool SQL Refactor. Thanks to Louis Davidson for sharing this info, you can get all the details including a download link on his blog right here: http://drsql.spaces.live.com/blog/cns!80677FB08B3162E4!1422.entry

Download it, play with it and let me know what you think

Three Team Edition for Database Professionals Screencasts On Channel 9

Channel 9 has three screencast about Team Edition for Database Professionals

Team Edition for DB Pros 5 min Demo
"I'd like to introduce you to the latest edition of Visual Studio Team System - Team Edition for Database Professionals.

Check out this quick 5 minute demo to get a whirlwind tour of exactly what Team Data can do for you."


Creating a database project with Team Edition for Database Professionals
"I'd like to introduce you to how to create your database project using the latest edition of Visual Studio Team System - Team Edition for Database Professionals.

Check out this quick 10 minute demo to get a whirlwind tour of project creation within VSTE for DB Pro."


Configuring Design DB for Team Edition for Database Professionals
"This video will describe how to install and configure SQL Server 2005 to support Visual Studio Team Edition for Database Professionals database projects.

Richard Waymire is the Program Management Architect for Visual Studio Team System for Database Professionals. He’s been with Microsoft for more than 8 years, having been in the SQL Server team for most of that time. He’s the author of several books on SQL Server, a contributing editor to SQL Server Magazine, and a frequent speaker at SQL Server events."


Enjoy them.

SQL Server Teaser

Here is a quick SQL Server teaser

Create the following table

CREATE TABLE [barney ]
(
barneyId INT
)


Then look at the following 4 statements which one will fail?
Do not run the statements try to guess, Is it A, B, C or D (or more than one?)

--A
INSERT [barney ] VALUES (1)

--B
INSERT barney VALUES (1)

--C
INSERT "barney" VALUES (1)

--D
INSERT [barney] VALUES (1)

BTW the idea for this post came after reading "Another reason to hate quoted identifiers..." on Louis Davidson's blog

Top 5 Posts For September 2006

Below are the top 5 posts according to Google Analytics for the month of September 2006 in order by pageviews descending


Login failed for user 'sa'. Reason: Not associated with a trusted SQL Server connection. SQL 2005
COALESCE And ISNULL Differences
Top 10 Articles of all time
OPENROWSET And Excel Problems
Store The Output Of A Stored Procedure In A Table Without Creating A Table

Top SQL Server Google Searches For September 2006

These are the top SQL Searches on this site for the month of September I have left out searches that have nothing to do with SQL Server or programming (for example atlantic city escorts)

calculating application availability
pl/sql code to calculate application availability
vb .net Datagrid column naming
does not have the identity property
application availability report and pl/sql
autoincrement
datetime string
sqldatareader stored proc clr
OUTER JOIN
OUTER JOIN SQL 2000 example

I always find it interesting to see what people are searching for and it also gives me ideas for things to write about

iWoz: From Computer Geek to Cult Icon: How I Invented the Personal Computer, Co-Founded Apple, and Had Fun Doing It

How I wish I had more time and needed less sleep (less than the 4-5 hours I am getting now) I am very excited about this book and will for sure put it on my Christmas list

Book Description
The mastermind behind Apple sheds his low profile and steps forward to tell his story for the first time.

Before cell phones that fit in the palm of your hand and slim laptops that fit snugly into briefcases, computers were like strange, alien vending machines. They had cryptic switches, punch cards and pages of encoded output. But in 1975, a young engineering wizard named Steve Wozniak had an idea: What if you combined computer circuitry with a regular typewriter keyboard and a video screen? The result was the first true personal computer, the Apple I, a widely affordable machine that anyone could understand and figure out how to use.

Wozniak's life—before and after Apple—is a "home-brew" mix of brilliant discovery and adventure, as an engineer, a concert promoter, a fifth-grade teacher, a philanthropist, and an irrepressible prankster. From the invention of the first personal computer to the rise of Apple as an industry giant, iWoz presents a no-holds-barred, rollicking, firsthand account of the humanist inventor who ignited the computer revolution. 16 pages of illustrations.

Amazon link is here for those interested

Return All 78498 Prime Numbers Between 1 and 1000000 Continues in the Land Down Under

So this Prime Number challenge won't die, the other day I wrote about it in THIS post. Rob Farley from Down Under let me a comment with two approaches he took, I decided to link to them from a seperate post. His first attempt is primes and his second attempt is More On Primes. His approach is interesting since he doesn't delete from the table but actually inserts into the table. Make sure you check it out

Trouble With ISDATE And Converting To SMALLDATETIME

If you want to use the ISDATE function to convert a value to a SMALLDATETIME you also have to take into consideration that SMALLDATETIME stores date and time data from January 1, 1900, through June 6, 2079 but DATETIME stores date and time data from January 1, 1753 through December 31, 9999
So even though the ISDATE function returns 1 for the date 1890-01-01 this can not be converted to SMALLDATETIME and you will receive an error message after you run the following statement

SELECT CONVERT(SMALLDATETIME,'18900101')

Server: Msg 296, Level 16, State 3, Line 1
The conversion of char data type to smalldatetime data type resulted in an out-of-range smalldatetime value.


Also be careful with rounding
Run these four statements
SELECT CONVERT(SMALLDATETIME,'2079-06-06 23:59:29')
SELECT CONVERT(SMALLDATETIME,'2079-06-06 23:59:29.998')
SELECT CONVERT(SMALLDATETIME,'2079-06-06 23:59:29.999')
SELECT CONVERT(SMALLDATETIME,'2079-06-06 23:59:30')


The first two are fine , the second two blow up because the value gets rounded up to the next day after it gets rounded up to the next minute (and hour)

I decided to roll out my own fnIsSmallDateTime() function because who wants to write the same CASE ISDATE when Value between this and that code all over the place?

Here is the code for the user defined function


CREATE FUNCTION fnIsSmallDateTime(@d VARCHAR(50))
RETURNS BIT
AS
BEGIN
DECLARE @bitReturnValue BIT


SELECT @bitReturnValue =CASE
WHEN ISDATE(@d) = 1 THEN CASE
WHEN CONVERT(DATETIME,@d) > ='19000101'
AND CONVERT(DATETIME,@d) <= '20790606 23:59:29.998' THEN 1
ELSE 0
END
ELSE 0
END
RETURN @bitReturnValue
END
GO


Let's create a test table with values
CREATE TABLE TestSmallDate (SomeDate VARCHAR(40))
INSERT TestSmallDate VALUES ('19000101')
INSERT TestSmallDate VALUES ('18991231')
INSERT TestSmallDate VALUES ('19010101')
INSERT TestSmallDate VALUES('20790607')
INSERT TestSmallDate VALUES ('2079-06-06 23:59:29.677')
INSERT TestSmallDate VALUES ('2079-06-06 23:59:29.998')
INSERT TestSmallDate VALUES ('2079-06-06 23:59:29.999')
INSERT TestSmallDate VALUES ('2079-06-06 23:59:59.000')
INSERT TestSmallDate VALUES('2079-06-06 01:00:00')
INSERT TestSmallDate VALUES ('2079-06-06 00:00:00')
INSERT TestSmallDate VALUES ('2079-06-06 00:00:01')
INSERT TestSmallDate VALUES('WhoIsYourDaddy')

If you want NULL for values that can not be converted to SMALLDATETIME use this code

SELECT dbo.fnIsSmallDateTime(SomeDate),
CASE dbo.fnIsSmallDateTime(SomeDate)
WHEN 1 THEN CONVERT(SMALLDATETIME,SomeDate) END AS ConvertedToSmallDate,
SomeDate
FROM TestSmallDate

if you want to convert the values that can not be converted to SMALLDATETIME to '1901-01-01 00:00:00' use the code below

SELECT dbo.fnIsSmallDateTime(SomeDate),
CASE dbo.fnIsSmallDateTime(SomeDate)
WHEN 1 THEN CONVERT(SMALLDATETIME,SomeDate)
ELSE CONVERT(SMALLDATETIME,'19000101') END AS ConvertedToSmallDate,
SomeDate
FROM TestSmallDate


Return only data that can be converted to SMALLDATETIME

SELECT * FROM TestSmallDate
WHERE dbo.fnIsSmallDateTime(SomeDate) =1



Return only data that can not converted to SMALLDATETIME

SELECT * FROM TestSmallDate
WHERE dbo.fnIsSmallDateTime(SomeDate) =0

SQL Server Application Platform Podcast About SQL Server Service Broker On Channel 9

Channel 9 has a two part podcast with Roger Wolter about SQL Server Service Broker. WMA, MP3 and Video formats are available for download

From the site: "You are thinking of a messaging solution for your application. A solution that can exchange messages reliably, predictably and in-order. A solution that offers queue like functionality only better. What is it you ask? None other than SQL Server 2005 and this very interesting technology known as SQL Service Broker that is built right into it. On today’s program I’m joined by my colleague Roger Wolter who is going to give us all the juicy details"

Get the episodes here --> part1, part2

Cool And Sexy New SQL Server Blog

That's right! What is more cool or sexy than Query Optimizations? It doesn't matter how beautiful or complex your data model is, if you show to your boss that a query used to take 17 seconds and now runs in 300 milli-seconds then you are the new SQL superhero.

If some of the following terms are foreign to you (CTRL + K, Index Scan, Index Seek, Table Scan, Sargable, Index Hint, Parameter Sniffing, Missing Statistics, L2 Cache, Compilation, Optimal Plans) then I have the blog for you right here
Tips, Tricks, and Advice from the SQL Server Query Processing Team
Even if you do know about those terms then this is still the blog for you since there is tons of stuff that you did not know yet. so make sure to check it out and add it to your feed

Return A Rowcount By Using Count Or Sign

Sometimes you are asked by the front-end/middle-tier developers to return a rowcount as well with the result set. However the developers want you to return 1 if there are rows and 0 if there are none. How do you do such a thing?
Well I am going to show you two ways. the first way is by using CASE and @@ROWCOUNT, the second way is by using the SIGN function

For CASE we will do this

RETURN CASE WHEN @@ROWCOUNT > 0 THEN 1 ELSE 0 END

So that's pretty simple, if @@ROWCOUNT is greater than 0 return 1 for everything else return 0

Using the SIGN function is even easier, all you have to do is this

RETURN SIGN(@@ROWCOUNT)

That's all, SIGN Returns the positive (+1), zero (0), or negative (-1) sign of the given expression. In this case -1 is not possible but the other two values are
So let's see this in action


USE pubs
GO

--Case Proc
CREATE PROCEDURE TestReturnValues
@au_id VARCHAR(49) ='172-32-1176'
AS
SELECT *
FROM authors
WHERE au_id =@au_id

RETURN CASE WHEN @@ROWCOUNT > 0 THEN 1 ELSE 0 END
GO

--Sign Proc
CREATE PROCEDURE TestReturnValues2
@au_id VARCHAR(49) ='172-32-1176'
AS
SELECT *
FROM authors
WHERE au_id =@au_id

RETURN SIGN(@@ROWCOUNT)
GO


--Case Proc, 1 will be returned; default value is used
DECLARE @Rowcount int
EXEC @Rowcount = TestReturnValues
SELECT @Rowcount
GO

--Case Proc, 0 will be returned; dummy value is used
DECLARE @Rowcount int
EXEC @Rowcount = TestReturnValues 'ABC'
SELECT @Rowcount
GO

--Sign Proc, 1 will be returned; default value is used
DECLARE @Rowcount int
EXEC @Rowcount = TestReturnValues2
SELECT @Rowcount
GO

--Sign Proc, 0 will be returned; dummy value is used
DECLARE @Rowcount int
EXEC @Rowcount = TestReturnValues2 'ABC'
SELECT @Rowcount
GO


--Help the environment by recycling ;-)
DROP PROCEDURE TestReturnValues2,TestReturnValues
GO

Happy One Year Anniversary

So here we are one year and 236 posts later. I can not believe that it has been one year already. First of all I will make 2 small changes. The first change is that I will feature a blog/site of the week; this will always happen on a Friday. I will link to the blog and link to the 5 most interesting posts/articles. If possible I will say a little something about the person whose site it is, something like author of this book and an interview is available here.

The second change is that I will write some stuff that has nothing to do with SQL Server but might still be of interest to you. This I will publish on weekends so that you can skip that easily if you check on weekdays only. What will I write? Maybe something that goes on in my life or a book or movie review. However I will not review the Matrix, Titanic or some other well know movie. No I will pick something that is not as popular for example Ghost In The Machine, The Seven Samurai, Animatrix. For books this could be Crypto, The Cobra Event or The Coming Plague

Or I could write that once you have kids and you do NOT have TIVO then Comcast On Demand really rocks. For example Jericho is a show that I just started to watch, this show reminded me a little bit of The Stand by Stephen King (his best book together with Thinner, It and Salems Lot)
So what is so cool about On Demand? No commercials, that’s right; nada. Pause and Resume for up to 24 hours, this is a must have with newborns.

Comcast announced a deal with CBS to have the following shows free the day after it airs: CSI: Crime Scene Investigation, CSI: Miami, CSI: NY, Survivor, NCIS, Numb3rs, Jericho and Big Brother

That’s it for now

Return All 78498 Prime Numbers Between 1 and 1000000 In 3 seconds

That is right folks; SQL Server is capable of returning all 78498 prime numbers between 1 and 1000000 in 3 seconds. Who said that SQL Server isn't suitable for this task?

Let's start with a little bit of history; Ward Pond had a posting on his blog on how to create a table with 1000000 rows. Hugo Kornelis replied with a solution that ran in 1110 ms. For fun I left the following comment: “How about the next challenge is to return all 78498 prime numbers between 1 and 1000000?”

Ward took the challenge and posted a solution that would take hours to complete. Then Hugo Kornelis posted a solution that took 8 seconds. After that Ward tweaked Hugo’s solution and got it down to 3 seconds. That is just unbelievable. I wonder how long it would run if you were to code something like that in C, C++, C# or your favorite language?

Any takers?